Stirring during the mash is good to maintain uniform temperatures, but not really necessary.
Some people like to use them during fly sparging, but just the top inch of the bed. This reduces channeling.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk